<template>
	<el-card class="box-card">
		<div slot="header" class="clearfix">
			<span>更换头像</span>
		</div>
		<div>
			<!-- 图片，用来展示用户选择的头像 -->
			<img class="the_img" src="../../assets/images/avatar.jpg" alt="" v-if="!this.avatar" />
			<img class="the_img" :src="this.avatar" alt="" v-else />

			<!-- 按钮区域 -->
			<div class="btn-box">
				<input type="file" accept="image/*" style="display: none" ref="iptRef" @change="onFileChange" />
				<el-button type="primary" icon="el-icon-plus" @click="chooseImg">选择图片</el-button>
				<el-button type="success" icon="el-icon-upload" :disabled="avatar === ''">上传头像</el-button>
			</div>
		</div>
	</el-card>
</template>
<script>
import { updateAvatarAPI } from '@/api'
export default {
  data () {
    return {
      avatar: ''
    }
  },
  methods: {
    chooseImg () {
      /* 模拟点击行为 */
      this.$refs.iptRef.click()
    },
    onFileChange (e) {
      const files = e.target.files
      if (files.length === 0) {
        this.avatar = ''
      } else {
        // 1. 创建 FileReader 对象
        const fr = new FileReader()
        // 2. 调用 readAsDataURL 函数，读取文件内容
        fr.readAsDataURL(files[0])
        // 3. 监听 fr 的 onload 事件
        fr.onload = async e => {
          // 4. 通过 e.target.result 获取到读取的结果，值是字符串（base64 格式的字符串）
          this.avatar = e.target.result
          const { data: res } = await updateAvatarAPI(this.avatar)
          console.log(res)
          if (res.code !== 0) return this.$message.error('更换头像失败')
          this.$message.success('更换头像成功')
          this.$store.dispatch('initUserInfo')
        }
      }
    }
  }
}
</script>
<style lang="less" scoped>
.btn-box {
	margin-top: 10px
}

.preview {
	object-fit: cover;
}

.the_img {
	width: 350px;
	height: 350px;
}
</style>
